x = int(input())
if x < 30: 
  print('No')
else: print('Yes') x = int(input()) x int(input()) int input() input if x < 30: 
  print('No')
else: print('Yes') x < 30 x 30 print('No') print 'No' x = int(input()) int(input()) x
x = int(input())
if x < 30: 
  print('No')
else: print('Yes')